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Share Capital (Share Capital) (Details) - USD ($)
$ in Millions
 12 Months Ended
Feb. 09, 2017
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of number of shares outstanding [abstract]      
Beginning balance   $ 1,759.4  
Shares issued through:      
Equity financing (in shares) 31,450,000    
Ending balance   $ 2,681.2 $ 1,759.4
Issued capital [member]      
Reconciliation of number of shares outstanding [abstract]      
Number of shares outstanding   267,076,495.000 257,070,005
Beginning balance   $ 2,822.2 $ 2,773.7
Shares issued through:      
Acquisitions (in shares)     4,788,039
Acquisitions   $ 0.0 $ 17.5
Acquisitions (shares)   88,398,804  
Acquisitions   $ 615.3 $ 0.0
Equity financing (in shares)   31,450,000  
Equity financing   $ 241.8  
Share-based employment compensation plans (in shares)   542,250.0 1,457,872
Share-based compensation plans   $ 3.5 $ 9.7
Exercise of warrants (in shares)   332,466.0 432,191
Exercise of warrants   $ 0.5 $ 1.2
Flow-through share financing (in shares)   1,301,535 3,328,388.0
Flow-through share financing   $ 8.4 $ 20.1
Number of shares outstanding   389,101,550.00 267,076,495.000
Ending balance   $ 3,691.7 $ 2,822.2